How do you break in a diesel? - Chevy and GMC Duramax Diesel Forum
2011+ LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 04-13-2011, 10:44 PM   eBay Motors  #1 (permalink)
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How do you break in a diesel?

I just picked up my truck last night and so far have been gentle. On my gas cars, i just drive them like I stole them from the second I get in them. Just easy on the brakes for 500 miles. My gas cars never burn oil and run great with this break in.

I am new to diesels, and this was not a cheap purchase. What is the best way to break in a new diesel engine?
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Old 04-13-2011, 10:53 PM   eBay Motors  #2 (permalink)
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Drive it.... I'd be easy on it first 500-1000 miles personally, but not necessary.

Change your spin on trans filter at around 4-5k miles. It's $8-11 from a vendor on here.
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Old 04-13-2011, 10:56 PM   eBay Motors  #3 (permalink)
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put diesel in it?

As far as im concerned break in period is the first 1000 miles.
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Old 04-13-2011, 11:00 PM   eBay Motors  #4 (permalink)
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Ya your suppose to wait 500 miles to tow and drive easy till 1000. I changed my oil at 2500 miles then at 5000 and every 5000 after that.
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Old 04-13-2011, 11:03 PM   eBay Motors  #5 (permalink)
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like the above post, not totally necessary but if it were mine, I would the first500 miles vary the RPM, like back road driving, not holding a steady RPM for more than a few minutes. I wouldn't load maximum for about a 1000 miles, and no foot to the floor launches. I agree with the change the spin-on tranny filter, and double check the fluid levels. Break-in isn't what it used to be but transmission break-in might be.. Just my opinion of course..
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Old 04-13-2011, 11:20 PM   eBay Motors  #6 (permalink)
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yep, I changed the oil and filter on my 2010 camaro ss at 500, 1000, then every 5000 miles. but i just drive the crap outta that car and it just gets stonger. I will take it easy on this truck for 500 miles, give it new oil and filter, then game on
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Old 04-14-2011, 05:03 AM   eBay Motors  #7 (permalink)
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changing oil at 500 miles might be counter-productive, it holds 10 qts. and I would let it in at least 2000, no more than 2500 miles. Just to make sure all the wear in is done, close to 50 bucks if you do it yourself. I've always heard the term "break-in oil" for first oil change, not sure if there is any truth in that though.. Don't neglect the spin -on for the transmission at 5000 like the earlier post, cheap insurance for a very expensive piece..
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Old 04-15-2011, 10:10 AM   eBay Motors  #8 (permalink)
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The 2nd day I picked it up I had my GN hitch in already. It towed a 16,500lb trailer just fine! Theres not a day it gets a break...
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Old 04-17-2011, 02:50 PM   eBay Motors  #9 (permalink)
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I personally believe that they should be driven like it will be driven for break in. Unless that is at the same RPM and load for extended periods (like said before). Day one, and 100 KM into the life of my new LML I was towing 8000lbs up a serious grade. I guess time will tell! Anybody take a look in the manual and see if it says anything??
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Old 04-17-2011, 05:09 PM   eBay Motors  #10 (permalink)
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The owners manual that came in my truck said NOT drive over 55 for the first 500 miles to get the longest life out the engine. I did that! I changed the oil at 1200 miles.

I have noticed in other postings suggesting early change of the transmission fluid as well. I am going to do that soon.

Like my past truck, I will change the oil as suggested by the DIC. I understand it measures how hard you work your truck adjusting the interval based on your need NOT based on miles.

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Last edited by BigBill; 04-17-2011 at 05:11 PM. Reason: typo
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